Girard will play Katarina Wirz and Wespi-Tschopp will play Rocko, hoofers somehow involved in a Dancing With the Stars-esque show at which Brennan and Booth go undercover.

The SYTYCD victors will be among friends; the reality show’s Mary Murphy and Tyce Diorio will play themselves as judges in the episode, and former contestant and sometime choreographer Dmitry Chaplin will portray a pro in the show-within-a-show. (Interesting to note: This isn’t the first crossover between the two Fox properties; SYTYCD All-Star Stephen “Twitch” Boss played a battle dancer in a Season 6 episode of Bones.)